Electric potential problem

1. The problem statement, all variables and given/known data
derive an expression for the electrical potential at a distance x measured along the axis from the centre of a circular ring of radius R on which a charge Q is uniformly distributed.hence derive an expression for the electric field strength at this point

2. Relevant equations
to be honest im not too sure where to go after:
V= -⌠E.dl
any guidance at all would be much appreciated!!!thanks